Airflow, in/out?

seamp · 16 Dec 2020 at 00:26

Hello guys, what would you recommend for this loop?
Right now, I have 16 fans (push pull) in the front on 2 480mm rads with air blowing in.
On top, 6 140mm fans (push pull) with air blowing out.
In the back, right now, 2 120mm fans blowing out (thinking of switching these to 140mm)
shall I turn the fans around in the top and only have air blowing out in the back?
Cheers!

MikeTimbers · 16 Dec 2020 at 08:46

you need some balance. front coming in, top and rear going out.

seamp · 16 Dec 2020 at 11:30

But now the top rad is going to be cooled by the ”hot” air from inside?

ttaskmaster · 16 Dec 2020 at 11:38

seamp said:
Hello guys, what would you recommend for this loop?

Depends... You have (effectively) 8 fans blowing in and five extracting. That creates positive pressure, which many people seem to prefer.
What problems are you currently experiencing?

Brizzles · 16 Dec 2020 at 15:19

Front in / top and back out.

TBH with the amount of radiator area you have i doubt it will make much difference.

Nice set-up btw

seamp · 17 Dec 2020 at 08:54

ttaskmaster said:
Depends... You have (effectively) 8 fans blowing in and five extracting. That creates positive pressure, which many people seem to prefer.
What problems are you currently experiencing?

Im not experiencing any problems, im in the beginning of building the custom loop

seamp · 17 Dec 2020 at 08:54

Brizzles said:
Front in / top and back out.

TBH with the amount of radiator area you have i doubt it will make much difference.

Nice set-up btw

Thanx !

ttaskmaster · 17 Dec 2020 at 10:52

seamp said:
Im not experiencing any problems, im in the beginning of building the custom loop

So why not try it as is and see if it works well enough before fretting about flow directions?
Right now your existing setup should have absolutely massive airflow even on low RPMs.

seamp · 17 Dec 2020 at 12:31

ttaskmaster said:
So why not try it as is and see if it works well enough before fretting about flow directions?
Right now your existing setup should have absolutely massive airflow even on low RPMs.

Because its so boring to drain the loop. Thats why I asked for your opinions before I fill it up

ttaskmaster · 17 Dec 2020 at 13:18

seamp said:
Because its so boring to drain the loop. Thats why I asked for your opinions before I fill it up

You hardlining it?
If not, soft tubing is usually flexible enough to swap fans around without the need for draining.
But as is, you should have more than enough airflow and a massive rad cooling area.

seamp · 17 Dec 2020 at 14:31

ttaskmaster said:
You hardlining it?
If not, soft tubing is usually flexible enough to swap fans around without the need for draining.
But as is, you should have more than enough airflow and a massive rad cooling area.

Hardline yes

I’ll try and see, but I think, as you say, It’ll cool enough, better than my prev aio 240
3090 and 10900k went up to 94 degrees celsius when I stressed it maby I Will get some degrees better after this

ttaskmaster · 17 Dec 2020 at 15:21

seamp said:
Hardline yes

Yeah, that will be more awkward... Easy enough to drain, but a PITA to relocate stuff. But regardless, I think your current setup should do ridiculously well.

seamp said:
But now the top rad is going to be cooled by the ”hot” air from inside?

Think of it more as heat being taken away by the air passing through the rad, rather than the air actually cooling it. That's why even 'warmer' air from inside the case still 'cools' when exhausted.

Drumroll · 19 Dec 2020 at 17:28

Similar dilemma here. 3 rads, side and bottom, intake, top exhaust + rear exhaust fan.
Tried thrall intake for rad, NVME and back of GPU suffered.
At idle, considering the vast rad area, the coolant almost warm up passing the top rad, rather than cool. 1 or 2C. But the next rad, would bring the temperature down again.
But under load, that's when you'll benefit from the top exhaust, specially if that rad is after the GPU or the CPU. Mine is after the GPU. The top rad pretty much "manages" much of the heat, blowing out of the case all that, and the other 2 rads, even if throw some warmer air inside the case, isn't that much, and the rad after the Monoblock doesn't add much heat, as most of the time the GPU would be under load, but the CPU not really.
Tried to run CPU - GPU - Top rad, and CPU got 2 or 3C hotter.
For.your system, I would recommend intake front, CPU - GPU - Top rad exhaust.
Push pull, used before, would use it now. Have some.nice beQuiets here at 35-40%, and the airflow after the rad allow some.nice "stream" cooling everything. If it was only to cool the rads, 20-30% would be plenty, but I'm obsessed about lower temps.